Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd7744be1a12798…

MALICIOUS

PDF

80.1 KB Created: 2021-02-23 10:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f3e13bc729c71a127a9d9a58037614a1 SHA-1: a9163a48933235c9dba91ca7826767f545ac781c SHA-256: 6bd7744be1a127984a40679471e7f159c000958a5b40e58fb4326df900e82621
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/wix?keyword=crushing+book+td+jakes+pdf PDF link annotation
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/5858328.pdfIn PDF document text
    • https://visopitolunew.weebly.com/uploads/1/3/1/4/131483219/9689760.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/1358915.pdfIn PDF document text
    • https://kevibudoja.weebly.com/uploads/1/3/0/8/130814666/487140.pdfIn PDF document text
    • http://luminar2-download.xyz/movie_website_for_mobilegp0ya.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/5cb366f7d7f05ba.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/Hhcjeiv/gatonirodaliru.pdfIn PDF document text
    • https://silatasetexa.weebly.com/uploads/1/3/1/6/131637876/vikasobuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refitebi.epizy.com/tologuvosugisizixomumap.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/pandas_for_python_2._7_linux.pdfIn PDF document text
    • http://tanamumejoxa.epizy.com/78440400574.pdfIn PDF document text
    • http://buwepuxaj.epizy.com/payroll_administrator_job_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/vawupugixevefabizexej.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/82973081578.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 5456 bytes
SHA-256: 0b510cbddf65016f5eb5ab2d0a29f98f9423acadee4fc46313b0a89ad3611428
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 9932 bytes
SHA-256: b31afe0f1a30ac3951f2e49c9e9cc70e3393fae4d4fde41d2be51c74cfb19f7d

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